That's right. Sweden was a superpower too, especially when one of their kings decided it was a shame to waste the Swedish lives and gathered a mighty mercenary army that made Bohemia (Czechia) a no-man's land during the Thirty Year War, for example. The Swedish invasion in the 17th c. called "The Deluge" was to some extent the revenge for earlier doings of our King Sisigmundus of Vasa (the one who moved our capital city from Cracow to Warsaw and can be seen at the statue in the Castle Square in Warsaw). So, the King Zygmunt decided he owned the Crown of Sweden and he should retrieve it by a Polish invasion. That was the last invasion of the Swedish territory ever; the Poles lost that campaign.
You know how it is with superpowers. Some time later the Swedes decided it was their turn and invaded Poland. They were successful to deluge our country, approaching as far as Silesia. However, the Polish recovered, united, and threw out the Swedish behind the Baltic Sea. The Stockholm Royal Armory still keeps artefacts plundered in Poland as well as the armour of their King Carolus Gustavus with the Polish bullet-hole in the back and a blooded shirt. The history has its meanders.